Objectives Rhabdomyoma, the most common primary fetal cardiac tumor, is often associated with tuberous sclerosis (TS). (relative risk (RR), 20.6; 95% CI,; P = 0.009) and fetal dysrhythmia (RR, 13.6; 95% CI,; P = 0.001) were significantly associated with neonatal morbidity. TS, present in 85/133 (63.9%)